Hairdryer attachment



FIG. 1 shows a perspective view of a hairdryer attachment showing my new design;

FIG. 2 shows a left side view thereof;

FIG. 3 shows a right side view thereof;

FIG. 4 shows a front view thereof;

FIG. 5 shows a rear view thereof;

FIG. 6 shows a top plan view thereof; and,

FIG. 7 shows a bottom plan view thereof.

The broken lines in the drawing depict parts of the hairdryer attachment that form no part of the claimed design. 

CLAIM The ornamental design for a hairdryer attachment, as shown and described. 